High-power narrow-spectrum diode laser systems based on tapered gain media in an external cavity are demonstrated at . Two long amplifiers are used, one with a long ridge-waveguide section (device A), the other with a long ridge-waveguide section (device B). Laser system A based on device A is tunable from 663 to with output power higher than in the tuning range; as high as output power is obtained at . The emission spectral bandwidth is less than throughout the tuning range, and the beam quality factor is 2.07 at an output power of . Laser system B based on device B is tunable from 666 to . As high as output power is obtained around . The emission spectral bandwidth is less than throughout the tuning range, and the beam quality factor is 1.13 at an output power of . Laser system B is used as a pump source for the generation of UV light by single-pass frequency doubling in a bismuth triborate (BIBO) crystal. An output power of UV light, corresponding to a conversion efficiency of , is attained.
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